Würzburg 2018 – scientific programme
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T: Fachverband Teilchenphysik
T 67: Neutrinophysik / theoretische Astroteilchenphysik
T 67.8: Talk
Wednesday, March 21, 2018, 18:20–18:35, Z6 - SR 2.011
Latest advances in the development of a poissonian based likelihood fit for the Double Chooz experiment — Denise Hellwig1, Philipp Kampmann2, Stefan Schoppmann3, •Philipp Soldin1, Achim Stahl1, and Christopher Wiebusch1 — 1III. Physikalisches Institut B, RWTH Aachen University — 2IKP Jülich — 3MPIK Heidelberg
Double Chooz is a reactor neutrino disappearance experiment with the purpose of a precise measurement of the neutrino mixing angle θ13. The experimental setup consists of two identical liquid scintillator detectors at average baselines of about 400m and 1km to two reactor cores at the nuclear power plant in Chooz, France. The neutrinos are detected by measuring the signature of the inverse beta decay (IBD), which consists of a prompt positron signal and a delayed neutron capture signal. By performing a simultaneous poissonian based likelihood fit of both detector neutrino rates, energy spectral shapes and all relevant backgrounds, the neutrino mixing angle θ13 can be obtained. The method, design and latest advances of such a likelihood fit are presented in this talk. Furthermore, a crosscheck for the latest final fit results is shown.